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Champlin & Rogers...........

Ratchets.

....

....Boston, Mass................See Page 60

Reamers.

...Chicago, Ill................... See Page 192 Red Lead.

Atlantic White Lead Co.-Rob't Colgate & Co. New York......See Pages 238, 240

Brooklyn White Lead Co..........

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.Philadelphia, Pa..
Philadelphia, Pa...

...See Page 268

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Reflectors.
Co...........New York.

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Retorts.

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Providence Tool Co.; H. B. Newhall, Agent....New York

General Rule for the Computation of Slate.

(Furnished by the Penrhyn Slate Co.)

From the length of the Slate take three inches, or as many as the third covers the first; divide the remainder by 2, and multiply the quotient by the width of the slate, and the product will be the number of square inches in a single slate. Divide the number of square inch s thus procured by 144, the number of square inches in square foot, and the quotient will be the number of feet and inc es required. A square of slate is what will cover 100 feet square, when properly laid upon the roof. TABLE OF SIZES AND NUMBER OF SLATE IN ONE SQUARE.

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THE WEIGHT of a Square of Slate is estimated in a general way (varying according to the thickness of the different makes), at from 600 to 700 lbs. per square.

No. of Slate

in a Square.

Size in

Inches.

No. of Slate

a Square.

ROMER & CO.

(ESTABLISHED IN 1837.)

MANUFACTURERS OF

SWITCH LOCKS,

BRASS and IRON PATENT PADLOCKS

OF EVERY DESCRIPTION.

PATENT STATIONARY RAILROAD

Car Door Locks.

Patent Piano, Sewing Machine Locks,

AND ALL KINDS OF

BRONZE KNOBS AND DOOR TRIMMINGS,

PLATED and PORCELAIN DOOR KNOBS, &c.

Nos. 141 to 145 Railroad Avenue,

NEWARK, N. J.

Illustrated Catalogues sent on application.

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Rand & Waring Drill & Compressor Co............New York.......

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.....See Front Page

New York................

.....See Page 76

Cleveland, Ohio........

.See Page 42

Rolling Mill Castings.

Rolling Mill Machinery.

Cleveland, Ohio..............See Page 120

Roofing Materials.

.New York..........

.New York.......

Roofing Plates.

LOCKS AND PADLOCKS.
STANDARD SIZES.

(Furnished by Romer & Co.)

No.

.........See Page 224

See Page 260

IRON SPRING PADLOCKS.

26, 214 inch Spring Padlock, no drop.

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27, 21

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No. 0, 1 1/2, 11% 1, 11 2, 114

13

21

21

66 brass drop.

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Spring Padlock,

drop and chain.

SELF-LOCKING TUMBLER BRASS SPRING

PADLOCK.

(Drilled Keys.)

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plain drop.

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No.

11, 212

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60, 2 in. Lock, spring drop, no chain.

drop and chain.

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12, 21%

Spring Padlock, spring

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14, 2" Spring Padlock, plain drop and chain.

66, 237

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15, 211⁄2" heavy R. R. Freight Car Lock, spring drop and chain.

16, 211⁄2 inch heavy Spring Padlock, spring drop, no chain.

17, 25% inch Spring Padlock, spring drop, no chain.

Extra Keys, $1.50 per dozen.

SELF-LOCKING TUMBLER BRASS SPRING

PADLOCK.

(Flat Keys.)

18, 25% inch heavy R. R. Car Lock, spring drop and chain.

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19, 3

inch heavy R R. Car Lock,

spring drop and chain.

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20, 3

inch heavy, 3 tumbler R. R. Car Lock and chain.

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21, 3 inch heavy 3 tumbler Store Door Padlock, spring drop, no chain.

22, 22 inch R. R. Switch and Car Lock, spring drop and chain.

23, 24 inch 3 tumbler, Spring Lock, spring drop, no chain,

24, 22 inch 3 tumbler, Spring Lock, spring drop, no chain. 25, 25% inch R R. Freight Car Tumbler Lock, spring drop and chain.

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A. L. HALE AND BRO.

Wholesale and Retail

Furniture Dealers,

10, 12, 14 AND 16 CANAL STREET,
CHICAGO, ILLINOIS.

We have the largest and best stock of Furniture in the West,
and make a specialty of

OFFICE FURNISHING.

WOODWORKING MACHINERY

Molding,

Mortising,

TENONING AND SHAPING

BAND SAWS,

MACHINES,

SCROLL SAWS,

Planing and Matching Machines, &c.,

FOR RAILROAD, CAR AND AGRICULTURAL SHOPS.

SUPERIOR TO ANY IN USE.

J. A. FAY & CO., CINCINNATI, OHIO.

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New York..

Cleveland, Ohio......

Radley & McAlister Manufacturiug Co............New York..
Vose, Dinsmore & Co......

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Rubber Goods.

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Goodyear's I. R. G. Manufacturing Co............New York..

Buffalo, N. Y...............

......See Page 202

Ropes.

.New York...
..Philadelphia, Pa............

...See Page 112

138

Rubber Belting, Hose, &c.

.New York......

.See Page 244

.Pittsburgh, Pa.................

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...Chicago, Ill......

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New York...

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...Chicago, Ill..............

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Buffalo, N. Y... See Page 196

.Avon, Conn......

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....New York.......

......See Last Page

Safety Valves,

Sandpaper, &c.

England & Bindley

.Troy, N. Y....... ............ See Page 50

New York.......

.Pittsburgh, Pa...See Page 162

266

Sash and Blind Machinery.

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...Cleveland, Ohio.......

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WOOD-WORKING MACHINERY.

Velocity of circular-saw at periphery, 6,000 to 7,000 feet per minute. the band-saw, 2,500 feet per minute.

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gang-saws, 20-inch stroke, 120 strokes a minute.
scroll-saws, 300 strokes per minute.

planing-machine cutters at periphery, 4,000 to 6,000 feet per minute.

Travel of work under planing-machine, 1-20th of an inch for each cut.

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planing-machine cutters, 3,500 to 4,000 feet per minute. squaring-up-machine cutters, 7,000 to 8,000 feet per minute. Speed of wood-carving drills, 5,000 revolutions per minute.

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machiné augers, 11⁄2 inch diameter, 900 revolutions per minute. machine augers, 34 inch diameter, 1,200 revolutions per minute. Gang-saws require for 45 super. feet of pine per hour, 1 HP indicated. Circular-saws require for 75 super. feet of pine per hour, 1 HP indicated. In oak or hard wood, 3/4ths of the above quantity require 1 HP indicated.

LEATHER GLUE.

A substance known as "leather glue" is prepared by mixing ten parts of sulphide of carbon with one of oil of turpentine, and adding enough gutta-percha to thicken the mass. The leather surfaces to be united must be freed from oil, which is accomplished by subjecting them to pressure by laying the leather upon blotting paper and applying a hot iron. After tracking together the edges to be joined with the cement, they are to be kept under pressure until the glue is entirely dry.

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