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The Names of such Colours as are necefsary for the Washing of Maps, Charts

, or Plots, with the manner how to temper and use the fame upon Velom, Paper or Parchment.

T is not convenient for a Surveyor I a Mannor, and reduced it to his intended bigness, to repair to a Painter to finish his work, the thing itself being very commen: dable, and easie to be attained. And be. sides a Painter is not to be found in-every Country, nor is every Painter furnished with Colours fitting for such a purpose, they for the most part using more gross and or. dinary Colours. Now for the benefit of such who desire to exercise themselves in this kind of practice, I have added these necessary directions following.

How to make Gum-Water,

Take Gun Arabick what quantity you please, of the whiteft and clearest you can gel, which bruise into small pieces, and tie them up loosely in a fine linnen Rag, then take of the clearest Water you can get, and put it into a clean velel, as a poringer, (or fuch like) then hang your Cloath in which

you put your Gum into this Water, letting it hang till all the Gum be dissolved; then when you put your fingers into this Water, if you find them to stick together, as if they were glewed, your Water is too stiff of the Gum, which you may remedy by putting thereto more fair Water, and if you find it too weak, you may add more Gum; with this Water most Colours are to be tempered.

Hom 10 make Allum-Water.

Take a Pound of Allum, and beat it to Powder, then take a Gallon of clean Water, and set it on a Fire, letting it boil till all the Allum be melted, then take it off the Fire, and when it is cold you may put it into a Vessel and keep it for your use : With this Water, if you wet your Paper before you lay on your Colours, it will keep them from finking into the Paper, and will also add a Luftre and Beauty to the Colours laid there

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Bice.

The Names of suchColours ås are neceTary for the

Wafbing of Maps, Plets, or Charts.
REDS. YELLOWS. BLEWS.
Vermillion, Gambooge.
Lake. Yellow Berries. Indigo.
Read Lead. Orpiment, i.e. Verditer;
Roffet. Arsnick Litmose.

Logwood
L

Brazile,

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