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Intro: When a Phillips Is Not a Phillips! Cross-head, Cross-Point, Cruciform, Square Drive Screws and Drivers These screw types have a + shaped recess on the head and are driven by a cross-head screwdriver, designed originally ... Step 1: Early Screws.
Sprinkler Head Types. There are a number of different types of sprinkler heads that meet different needs. This article covers the operation types (fusible link vs. bulb), the distribution types (pendant, upright, sidewall), and response temperatures. Fusible Link Sprinklers vs. Glass Bulb Sprinklers.