Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 723
- taking an impres-sion in precisely the same manner as in the case of the first Ftg. 666. … Wax Pattern. part of the medaUion mould. If the article to be copied is ofsuch a nature that it is inadmissible to copy it in this manner,an impression in wax or gutta-percha must be taken and aduplicate of the article made in plaster of Paris. Aftergetting the impression from the bass-relief,…
Physics · Lantern projection · Electric apparatus and appliances
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