[181] lxxxvi, 350-352 (‘Journ. Chem. Soc.’)
SPEC′TACLES. See Eye, Vision, &c.
SPEC′TROSCOPE. An instrument devised for examining the spectra of flames. (See below.)
SPEC′TRUM ANAL′YSIS. See Analysis, Spectrum.
SPEC′ULUM MET′AL. Prep. 1. Take of copper, 64 parts; pure tin, 69 parts; melt them separately under a little black flux; next incorporate them thoroughly by stirring with a wooden spatula, and run the metal into the moulds, so that the face of the intended mirror may be downwards; lastly, allow the whole to cool very slowly.
2. Pure copper, 2 parts; pure tin, 1 part. Used to make the mirrors of reflecting telescopes. The addition of a little metallic arsenic renders it whiter.
SPEL′TER. See Zinc.
SPERMACE′TI. Syn. Cetaceum (B. P., Ph. L., E., & D.), L. A concretion prepared
from the oily matter of the head of the Physeter macrocephalus, or spermaceti whale. It is demulcent and emollient; chiefly used in ointments and cerates.